Calipers.



C. J. STAMATIS.

CAUPERS.

APPLICATION m5!) APR.12.1918.

1,286,824, Patented Den. 3, 1918.

l m in 777195 J57iamafis.

CONSTANTINOS J. STAMATIS, OF PHILADELPHIA, PENNSYLVANIA.

CALIPERS.

Specification of Letters Patent.

Patented Dec. 3, 1918.

Application filed April 12, 1918. Serial No. 228,242.

To all whom it may concern:

Be it known that I, Coxs'rAN'rmos J. STA- .unrts. a citizen of theUnited States, rcsiding at 1223 X. 19th street. Philadelphia, in thecounty of Philadelphiaand State of leunsvlvania, have invented new anduseful Improvements in Calipers, of which the following is aspecification.

The invention relates to calipers and similar instruments. and has foran object to provide an instrument of precision for use in determiningdistances. thicknesses, and the. like, especially in the machine shopwhere a, tool of this character is employed for the purpose of measuringlengths, thicknesses or diameters of machine parts.

Among other features, the invention comprehends calipers that may beemployed as a divider. and which have parts thereof interchangeable tosuit a particular piece of work which is to be measured, or in whichcertain parts are to be divided oil', as the case may be.

Ordinarily a pair of calipers may be formed with ends which are curvedtoward each other; whereas, dividers usually are formed with pointedends. My invention comprehemls a combination of the two wherein I mayhave one of the ends of my instrument pointed or curved, as the case maybe. and whereby the instrument lnay be adapted for inside or outside orsurface measuring,

in the further disclosure of the lnvention,

reference is to be had to the accompanying drawing. constituting a partof this spec1fication, in which similar characters of reference. denotecorrespomling parts in all the views, and in which- Figure 1 is anelevation of the instrument.

Fig. 2 i a view looking at. an edge there- Oi. and

Fig. 3 is a fragmentary enlarged view partly in section, showing indetail the par.- ticular form of locking structure.

Fig. 4 is a slightly modified form of my invention showing an adjustmentfeature, and

Fig. 5 is a 'fragmentary enlarged sectional view of the structure shownin Fig. 4.

Referring more particularly to the views, 10 and 11 are the legs of thecalipers which are connected in any suitable manner at 12, whereby oneleg will be pivoted on the other, the leg 11 preferably ending at itsfree end in a curved portion 13. Suitably riy'eted or otherwise attachedto the leg 10 is a U-shaped spring clamp or locking element 1%, providedwith an opening 15, with the free end 16 of the locking element spacedfrom the side of the leg 10. The extremity of the leg- 10 is curved. asshown at 17 and is provided with an opening 18. A supplementary leg orprong element 19 is einployed for use in connection with the leg 10, andit is preferably formed of a single piece of metal curved at one end asat 20, and.

pointed at the other end as. at 21. This simplementary element isadapted to be inserted through the opening- 18 and through the opening15'. the element being provided with a series of notches 22. into whichthe end 16 of the clamp or holder will spring, thu's securing th elementrigidly on the leg 10. It will be seernthat the spring pressure on theclamp will firmly hold the element against movement in the openings 15and 18, and that the projecting portion of the element can be increasedor decreased in length beyond the bend 17 as desired.

For certain kinds of work the point of the supplementary element can beemployed in connection with the point of the other leg 11, or. thecurved part 20 of the element can be used by merely reversing theelement in position upon the leg 10, and having it locked by the clamp.

As mentioned heretofore, my instrument can be employed as calipersor-dividers, as the case may be, and the supplementary leg will besecurely locked against movement when the device is in use, and can bereadily removed and turned around to adapt the calipers or dividers toabove purposes. It

will be clear that a deviceof this character consists of few and simpleparts; cannot. readily get out of order; can be cheaply manufactured,and will effectively perform the functions for which it is desired.

In Figs. 4 and 5 I disclose a modified form of my invention, and inwhich instance the leg 11 has attached thereto a locking or clampingelement 23, consisting of a single piece of metallic material bent in asubstantial U-shape to provide a locking point .34 for lockingengagement with notches 25 in a supplementary leg. or prong element 26,said piece of'metal' being bent to form a right-angled portion 27 whichhas anopening 28 therein, through which the element 26 is adapted topass, a similar opening 29 being formed in the other end of the clampfor the passage of the element 26. The clamp is secured to the leg 11 bya rivet 30 which, however, will permit the clamp to be rotated upon theleg, and it will be seen that by having the lower or main body portionof the clamp bent, as shown at 31, the portion 32 of the clamp will bearagainst the faceof the leg, and thus tend tohold the clamp stationary.

It will be seen that when my device is used in connection withthe clampdescribed, as shown in Fig. 4, that the device can be employed as a pairof dividers with the point 21 and the point 33 of the element 26,whereby when a distance is n'ieasured, the slight rotation of the clamp23 upon the leg 11 will move the point 33 toward or away from the point21, so that accurate measurements can be obtained.

It will of course" be apparent that as in the construction shown inFigs. 1. 2 and 3,.

as Well as in the modification shown, the

removal of the supplementary leg or prong element 19 or 26, out oflocked engagement with the particular clamp used therewith, isaccomplished by simply turning or rotating the prong element half Wayaround, thus causing the locking end of the clamp to ride out of thenotch on to the periphery of the prong element, and thereby enabling theoperator to slide the prong element into a new adjusted position, orentirely out of engagement with the clamp element. as the case may be.

I claim 1. In an instrument of the character described, the combinationwith a plurality of pivoted legs, one of which has a curved portionprovided with an opening, of a spring clamp formed with an opening andhaving one end connected to said leg n juxtaposition to the curvedportion thereof. and a notched element slidingly passing throughmenthaving sliding engagement with the leg, and passing through theopening in the spring. with the spaced end of said spring normallybearing against said element.

35in calipersthe combination with one or more of the legs thereof, of anelement rorming an auxiliary leg and in sliding engagement with one ofthe legs and a U- shaped spring having one end secured to the leg. Saidspring extending longitudinally and lying to one side of the leg, withthe othe" end of the spring spaced from the leg to normally engage withsaid element.

a In testimony whereof I afiix my signature.

CONSTANTINOS J. STAMA'IIS.

